chr14-67651432-C-T

Position:

• chr14-67651432-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_006370.3(VTI1B):​c.652G>A​(p.Ala218Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000196 in 1,613,816 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.00014 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00020 (0 hom.)
• Consequence: VTI1B NM_006370.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.08

Genes affected

VTI1B (HGNC:17793): (vesicle transport through interaction with t-SNAREs 1B) Enables SNARE binding activity and chloride channel inhibitor activity. Involved in regulation of protein localization to plasma membrane. Located in several cellular components, including endosome membrane; lysosomal membrane; and perinuclear region of cytoplasm. [provided by Alliance of Genome Resources, Apr 2022]

ARG2 (HGNC:664): (arginase 2) Arginase catalyzes the hydrolysis of arginine to ornithine and urea. At least two isoforms of mammalian arginase exists (types I and II) which differ in their tissue distribution, subcellular localization, immunologic crossreactivity and physiologic function. The type II isoform encoded by this gene, is located in the mitochondria and expressed in extra-hepatic tissues, especially kidney. The physiologic role of this isoform is poorly understood; it is thought to play a role in nitric oxide and polyamine metabolism. Transcript variants of the type II gene resulting from the use of alternative polyadenylation sites have been described. [provided by RefSeq, Jul 2008]

GPHN (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.11097285).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
VTI1B	NM_006370.3	c.652G>A	p.Ala218Thr	missense_variant	6/6	ENST00000554659.6
ARG2	NM_001172.4	c.*512C>T		3_prime_UTR_variant	8/8	ENST00000261783.4
GPHN	XM_047430879.1	c.1313-83763C>T		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
VTI1B	ENST00000554659.6	c.652G>A	p.Ala218Thr	missense_variant	6/6	1	NM_006370.3	P1
ARG2	ENST00000261783.4	c.*512C>T		3_prime_UTR_variant	8/8	1	NM_001172.4	P1

Frequencies

GnomAD3 genomes AF: 0.000138 AC: 21 AN: 152194 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000262

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000235

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000147 AC: 37 AN: 251378 Hom.: 0 AF XY: 0.000177 AC XY: 24 AN XY: 135856

Gnomad AFR exome AF: 0.000123

Gnomad AMR exome AF: 0.0000578

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000653

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000273

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000202 AC: 295 AN: 1461622 Hom.: 0 Cov.: 31 AF XY: 0.000197 AC XY: 143 AN XY: 727098

Gnomad4 AFR exome AF: 0.000209

Gnomad4 AMR exome AF: 0.000134

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.000104

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000237

Gnomad4 OTH exome AF: 0.000149

GnomAD4 genome AF: 0.000138 AC: 21 AN: 152194 Hom.: 0 Cov.: 32 AF XY: 0.000148 AC XY: 11 AN XY: 74352

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.000262

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000235

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000180 Hom.: 0

Bravo AF: 0.000166

TwinsUK AF: 0.00 AC: 0

ALSPAC AF: 0.000259 AC: 1

ExAC AF: 0.000123 AC: 15

EpiCase AF: 0.000218

EpiControl AF: 0.000415

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Nov 21, 2023

The c.652G>A (p.A218T) alteration is located in exon 6 (coding exon 6) of the VTI1B gene. This alteration results from a G to A substitution at nucleotide position 652, causing the alanine (A) at amino acid position 218 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.30	T
BayesDel_noAF	Benign	-0.34
CADD	Benign	20
DANN	Uncertain	1.0
DEOGEN2	Benign	0.23	T
Eigen	Benign	-0.19
Eigen_PC	Benign	-0.10
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.84	T
M_CAP	Benign	0.0065	T
MetaRNN	Benign	0.11	T
MetaSVM	Benign	-0.79	T
MutationAssessor	Benign	1.9	L
MutationTaster	Benign	1.0	D;D
PrimateAI	Benign	0.31	T
PROVEAN	Benign	-2.2	N
REVEL	Benign	0.069
Sift	Benign	0.034	D
Sift4G	Uncertain	0.019	D
Polyphen		0.0090	B
Vest4		0.20
MVP		0.055
MPC		0.33
ClinPred		0.050	T
GERP RS		3.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.12
gMVP		0.69

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs780495647; hg19: chr14-68118149;